Reference for Pesachim 187:1

לרב יהודה לא קשיא טמא שרץ רחמנא דחייה דכתיב (במדבר ט, י) איש איש כי יהיה טמא לנפש מי לא עסקינן שחל שביעי שלו להיות בערב הפסח ואפילו הכי אמר רחמנא לידחי

On Rab Judah's view there is no difficulty: When one is unclean through a reptile, the Divine Law relegated him [to the second Passover], for it is written, 'If any man shall be unclean by reason of a dead body': does this not refer [even] to one whose seventh day falls on the eve of Passover, yet even so the Divine Law said: Let him be relegated [to the second].<span class="x" onmousemove="('comment',' V. supra ');">¹</span> Our Rabbis taught: If he was standing beyond Modi'im and is able to enter by horses and mules, you might think that he is culpable.

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